In a test of water cooled air compressor, it is found that the shaft work required to drive the compressor is 175 kJ/kg of air delivered and the enthalpy of air leaving is 70 kJ/kg greater than that entering and that the increase in enthalpy of circulating water is 90 kJ/kg.

Compute the amount of heat transfer to the atmosphere (in kJ/kg) from the compressor per kg of air.